I am going to list 3 different sleds from different eras
1. 1973 Viking Vigilante SS, had a 440 Kohler leaf blower in it and I think I put about 5000 miles on that sled over a couple of years, it had a wider front end and a rail suspension, also the first sled I rode with foot stirrups.
2. 1980 Polaris Centurion, 500 3 cylinder liquid with leaf springs, came from the factory with 24 studs right down the center. Of all the sleds I have owned this one seemed the fastest, it wasn't but with no suspension and a ski width of about 32 inches (just a guess) it really felt like you were almost flying, I did my first saddlebag trip on this sled, almost 600 miles in two days.
3. 2012 Polaris Switchback Assault, 800 Liberty twin with a 144 inch track, almost 5000 trouble free miles, just gas, add a little oil, and go. I can ride 300 miles in a day, both on and off trail and hardly tell that I have been riding. For what I do now it is almost a perfect sled. I hope to own quite a few more sleds over the next 20 to 25 years.